[R] Problems using "lm" in combination with "predict"

[Stephen Tucker]

I think you need 

predict(mod,newdate)

instead of 

predict(y,newdate)


--- "Maja Schröter" <maja.schroeter at gmx.de> wrote:

> Hello everybody,
> 
> I'm trying to predict a linear regression model but it does not work.
> 
> My Model: y = Worktime + Vacation + Illnes + Bankholidays
> 
> My modelmatrix is of dimension  28x4
> 
> Then I want to make use of the function predict because there
> confidence.intervals are include.
> 
> My idea was:
> 
> mod <- lm(y~Worktime+Vacation+Illnes+Bankholidays)
> 
> newdate=data.frame(x=c(324,123,0.9,0.1))
> predict(y,newdate)
> 
> But I always get the message:
> 
> 
> 'newdata' had 1 rows but variable(s) found have 28 rows
> 
> 
> What can I do?
> 
> Yours, 
> 
> Maja
> 
> -- 
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